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Clarify conversion rules for CallerArgumentExpression #5438

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Nov 17, 2021
Merged

Clarify conversion rules for CallerArgumentExpression #5438

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Clarify conversion rules for CallerArgumentExpression
333fred Nov 16, 2021
88ad077
Clarify bullet from feedback.
333fred Nov 17, 2021
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Update proposals/csharp-10.0/caller-argument-expression.md
333fred Nov 17, 2021
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1 change: 1 addition & 0 deletions proposals/csharp-10.0/caller-argument-expression.md
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Expand Up @@ -148,6 +148,7 @@ There should always be an expression corresponding to the `this` parameter. Even
- Multiple parameters marked with `CallerArgumentExpression` are permitted, as shown above.
- The attribute's namespace will be `System.Runtime.CompilerServices`.
- If `null` or a string that is not a parameter name (e.g. `"notAParameterName"`) is provided, the compiler will pass in an empty string.
- The type of the parameter `CallerArgumentExpressionAttribute` is applied to must have a standard implicit conversion from `string`. This means no user-defined conversions from `string` are allowed, and in practice means the type of such a parameter must be `string`, `object`, or an interface implemented by `string`.
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## Drawbacks
[drawbacks]: #drawbacks
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